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Flow injection unequal flow complexation detection method

A technology of flow injection and detection method, which is applied in the field of combined flow injection and high-sensitivity detector, can solve the problems of prolonged enrichment time and reduced sample output efficiency, and achieves improved sensitivity, lower detection limit, higher peak and concentration The effect of coefficients

Inactive Publication Date: 2010-06-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Multi-step adsorption pre-enrichment improves the adsorption effect and concentration coefficient, but greatly prolongs the enrichment time and reduces the sample output efficiency

Method used

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  • Flow injection unequal flow complexation detection method
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  • Flow injection unequal flow complexation detection method

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Experimental program
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Effect test

Embodiment 1

[0033] The present invention and its beneficial effects are further illustrated below by examples and accompanying drawings.

[0034] 1. Instruments and reagents

[0035] 3510 Atomic Absorption Spectrometer (China, Agilent Technologies Shanghai Co., Ltd.): Equipped with a deuterium lamp buckle background correction device and a lead hollow cathode lamp.

[0036] Instrument working conditions: lead measurement wavelength: 283.3nm; slit width: 0.2nm; acetylene flow rate: 1.5L / min; air flow rate: 7.0L / min; atomizer lifting speed: 10mL / min; reading mode: continuous, The interval is 0.5s.

[0037] FIA-3110 Flow Injection Analyzer (China, Beijing Kyrgyzstan Instrument Co., Ltd.): Equipped with dual peristaltic pumps and eight-channel injection valves, the drive, speed, time and valve position selection of the pumps are controlled by computer programs.

[0038] pHS-25 pH meter (China, Shanghai Leici Instrument Factory). Braided reactor: knotted with a polytetrafluoroethylene tube ...

Embodiment 2

[0065] A new technology of flow injection complexation with unequal flow rate, by reducing the flow rate of the complexing agent, the sample to be tested and the complexing agent are mixed at different flow rates, and the flow rate of the sample to be tested is 8ml·min -1 , the flow rate of the complexing agent is 0.1ml·min -1 , and then carry out flow injection sampling within 40s, inject the mixed solution into the braided reactor for reaction, and then input a section of air flow into the braided reactor for 4s, and then push the eluent dilute nitric acid into the braided reactor through the peristaltic pump , lasted for 20s, and brought the reacted metal ions and complexing agents into the flame atomic absorption spectrum for online detection.

[0066] The above method adjusts the flow rate of the metal ion and the complexing agent respectively, that is, reduces the flow rate of the complexing agent, so that the flow rate after the metal ion and the complexing agent are mi...

Embodiment 3

[0068] A new technology of flow injection complexation with unequal flow rate, by reducing the flow rate of the complexing agent, the sample to be tested and the complexing agent are mixed at different flow rates, and the flow rate of the sample to be tested is 12ml·min -1 , the flow rate of the complexing agent is 0.5ml·min -1 , and then carry out flow injection sampling within 80s, inject the mixed solution into the braided reactor for reaction, and then input a section of air flow into the braided reactor for 6s, and then push the eluent dilute nitric acid into the braided reactor through the peristaltic pump , lasted for 30s, and brought the reacted metal ions and complexing agents into the flame atomic absorption spectrum for online detection.

[0069] The above method adjusts the flow rate of the metal ion and the complexing agent respectively, that is, reduces the flow rate of the complexing agent, so that the flow rate after the metal ion and the complexing agent are m...

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Abstract

The invention relates to a flow injection unequal flow complexation detection method, which is characterized in that the samples to be detected and the complexing agents are mixed under the condition of unequal flow by reducing the flow of the complexing agents, flow injection sample introduction is carried out, mixed liquor is injected into a knotted reactor for reaction, then a segment of air flow is introduced into the knotted reactor, the eluent is pushed into the knotted reactor by a peristaltic pump, and the metal ions and the complexing agents after reaction are taken into the flame atomic absorption spectrum to undergo online detection. Compared with the prior art, the method reduces the detection limit of flame atomic absorption, improves the sensitivity of flame atomic absorption and greatly increases the atomic absorption peak and the concentration factor. The method is characterized by simpleness, convenience, high efficiency, practicability and the like.

Description

technical field [0001] The invention relates to the combined use of flow injection and a high-sensitivity detector, in particular to a flow injection complexation detection method with unequal flow velocity. Background technique [0002] In 1975, Ruzicka and Hansen first proposed flow injection (flow injection, FI), a new solution processing method. For the determination of ultra-trace elements in complex samples, a pre-enrichment separation step is required to reduce the detection limit and improve selectivity and sensitivity. The commonly used manual and batch pre-enrichment separation operations are not only time-consuming, consume a large amount of samples, but also the samples are easily contaminated and lost. Flow injection (FI) online pre-enrichment separation technology can not only overcome these shortcomings of manual and intermittent pre-enrichment separation operations, but also provides the possibility for the valence analysis of some elements. [0003] Flow i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/34
Inventor 王中瑗苏耀东李卓王敏张丽娟吴慧庆
Owner TONGJI UNIV
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